申请人:Sumitomo Chemical Company, Limited
公开号:US04048168A1
公开(公告)日:1977-09-13
3,4-Dihydro-2(1H)-quinazolinone derivatives of the formula, ##STR1## wherein R.sub.1 and R.sub.2 are each hydrogen, lower alkyl, lower alkylthio or lower alkoxy, or, when taken together, R.sub.1 and R.sub.2 may form methylenedioxy; R.sub.3 is polyhalo-lower alkyl; R.sub.4 is phenyl, halophenyl, lower alkoxyphenyl, lower alkylphenyl or thienyl; and X is oxygen or sulfur, which are known to be very useful intermediates for the preparation of anti-inflammatory and analgesic agents, are obtained in a high yield by reacting a compound of the formula, ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and X are as defined above, with a compound of the formula, R.sub.4 --CHO wherein R.sub.4 is as defined above, with heating in the presence of a zinc halide as a catalyst.
式中,R.sub.1和R.sub.2分别为氢、低级烷基、低级硫代烷基或低级氧代烷基,或者当两者结合时,R.sub.1和R.sub.2可以形成亚甲二氧基;R.sub.3为多卤低级烷基;R.sub.4为苯基、卤代苯基、低级氧代苯基、低级烷基苯基或噻吩基;X为氧或硫。这些化合物是制备抗炎和镇痛药物的非常有用的中间体,通过将式中化合物与式中R.sub.4-CHO化合物在锌卤化物催化下加热反应可以高产得到。